Device and method for condensing, drying and heating flue gas

Abstract

The invention discloses a device and method for condensing, drying and heating flue gas, in particular to a device and method for recovering and recycling condensed water in the flue gas and meeting the temperature requirement for diffusing pollutants in the flue gas to the upper air. A heat fluid outlet of a high-temperature heat tube heat exchanger of the device is connected with a heat fluid inlet of a low-temperature heat tube heat exchanger; a heat fluid outlet of the low-temperature heat tube heat exchanger is connected with a cold fluid inlet of the high-temperature heat tube heat exchanger. The method comprises the following steps of: introducing wet flue gas into an evaporation section of the high-temperature heat tube heat exchanger; heating a high-temperature heat tube; feedingthe wet flue gas subjected to temperature drop into an evaporation section of the low-temperature heat tube heat exchanger; feeding a coolant medium into the evaporation section of the low-temperature heat tube heat exchanger; reducing the temperature of the wet flue gas to below a dew point of water vapor under the action of the low-temperature heat tube; condensing the water vapor in the wet flue gas into water and discharging the water from a flue gas condensed water outlet; discharging the coolant medium absorbing the heat from a cold fluid outlet of the low-temperature heat tube heat exchanger; and heating the condensed dried flue gas by a high-temperature heat tube and discharging the heated flue gas by a chimney.

Description

technical field [0001] The invention relates to a device and method for recovering boiler flue gas condensed water, in particular to a flue gas condensation drying heating device and method. Background technique [0002] With the development of social economy and the improvement of people's living standards, water resources are increasingly precious. The flue gas produced by the combustion of fuels (including coal, oil, natural gas, biomass and municipal solid waste) contains a large amount of water vapor, which is discharged into the atmosphere through the chimney, which not only causes a great waste of water resources, but also causes water vapor in the chimney Condensation in the middle will condense into water and flow down the wall, causing corrosion and scaling of the chimney. If the water vapor in the flue gas can be recycled and utilized, improving the utilization rate of reclaimed water is of great significance to areas where water resources are scarce. [0003] T...

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Problems solved by technology

[0003] The conventional method of recovering flue gas condensate is to reduce the temperature of the flue gas to below the dew point of water vapor by means of cooling and heat exchange, and the water vapor in the flue gas will condense into water and be discharged, but this will cause a significant drop in the temperature of the flue gas

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